These are Genuine Genie garage door opener header brackets, door brackets, and curved/straight door arms that are compatible with many Genie models. Check out the part for full description and compatibility listings by model number.
The header bracket attached the garage door opener rail to the wall above the garage door. The door bracket attaches the door arm to the garage door. The door arms, curved and straight attach the carriage, shuttle (travelers) to the door bracket, which will be what raise and lower the garage door. It is important to make sure these are all installed properly and well maintained for the garage door opener to function correctly.